2 * drivers/pci/setup-res.c
4 * Extruded from code written by
5 * Dave Rusling (david.rusling@reo.mts.dec.com)
6 * David Mosberger (davidm@cs.arizona.edu)
7 * David Miller (davem@redhat.com)
9 * Support routines for initializing a PCI subsystem.
12 /* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
15 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/pci.h>
22 #include <linux/errno.h>
23 #include <linux/ioport.h>
24 #include <linux/cache.h>
25 #include <linux/slab.h>
29 void pci_update_resource(struct pci_dev *dev, int resno)
31 struct pci_bus_region region;
34 enum pci_bar_type type;
35 struct resource *res = dev->resource + resno;
38 * Ignore resources for unimplemented BARs and unused resource slots
45 * Ignore non-moveable resources. This might be legacy resources for
46 * which no functional BAR register exists or another important
47 * system resource we shouldn't move around.
49 if (res->flags & IORESOURCE_PCI_FIXED)
52 pcibios_resource_to_bus(dev, ®ion, res);
54 dev_dbg(&dev->dev, "BAR %d: got res %pR bus [%#llx-%#llx] "
55 "flags %#lx\n", resno, res,
56 (unsigned long long)region.start,
57 (unsigned long long)region.end,
58 (unsigned long)res->flags);
60 new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
61 if (res->flags & IORESOURCE_IO)
62 mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
64 mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
66 reg = pci_resource_bar(dev, resno, &type);
69 if (type != pci_bar_unknown) {
70 if (!(res->flags & IORESOURCE_ROM_ENABLE))
72 new |= PCI_ROM_ADDRESS_ENABLE;
75 pci_write_config_dword(dev, reg, new);
76 pci_read_config_dword(dev, reg, &check);
78 if ((new ^ check) & mask) {
79 dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
83 if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
84 (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
85 new = region.start >> 16 >> 16;
86 pci_write_config_dword(dev, reg + 4, new);
87 pci_read_config_dword(dev, reg + 4, &check);
89 dev_err(&dev->dev, "BAR %d: error updating "
90 "(high %#08x != %#08x)\n", resno, new, check);
93 res->flags &= ~IORESOURCE_UNSET;
94 dev_dbg(&dev->dev, "BAR %d: moved to bus [%#llx-%#llx] flags %#lx\n",
95 resno, (unsigned long long)region.start,
96 (unsigned long long)region.end, res->flags);
99 int pci_claim_resource(struct pci_dev *dev, int resource)
101 struct resource *res = &dev->resource[resource];
102 struct resource *root;
105 root = pci_find_parent_resource(dev, res);
109 err = request_resource(root, res);
112 const char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
113 dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
115 root ? "address space collision on" :
116 "no parent found for",
122 EXPORT_SYMBOL(pci_claim_resource);
124 #ifdef CONFIG_PCI_QUIRKS
125 void pci_disable_bridge_window(struct pci_dev *dev)
127 dev_dbg(&dev->dev, "Disabling bridge window.\n");
129 /* MMIO Base/Limit */
130 pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
132 /* Prefetchable MMIO Base/Limit */
133 pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
134 pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
135 pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
137 #endif /* CONFIG_PCI_QUIRKS */
139 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
142 struct resource *res = dev->resource + resno;
143 resource_size_t size, min, align;
146 size = resource_size(res);
147 min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
148 align = pci_resource_alignment(dev, res);
150 /* First, try exact prefetching match.. */
151 ret = pci_bus_alloc_resource(bus, res, size, align, min,
153 pcibios_align_resource, dev);
155 if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
159 * But a prefetching area can handle a non-prefetching
160 * window (it will just not perform as well).
162 ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
163 pcibios_align_resource, dev);
167 res->flags &= ~IORESOURCE_STARTALIGN;
168 if (resno < PCI_BRIDGE_RESOURCES)
169 pci_update_resource(dev, resno);
175 int pci_assign_resource(struct pci_dev *dev, int resno)
177 struct resource *res = dev->resource + resno;
178 resource_size_t align;
182 align = pci_resource_alignment(dev, res);
184 dev_info(&dev->dev, "BAR %d: can't allocate resource (bogus "
185 "alignment) %pR flags %#lx\n",
186 resno, res, res->flags);
191 while ((ret = __pci_assign_resource(bus, dev, resno))) {
192 if (bus->parent && bus->self->transparent)
202 dev_info(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
203 resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
208 /* Sort resources by alignment */
209 void pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
213 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
215 struct resource_list *list, *tmp;
216 resource_size_t r_align;
218 r = &dev->resource[i];
220 if (r->flags & IORESOURCE_PCI_FIXED)
223 if (!(r->flags) || r->parent)
226 r_align = pci_resource_alignment(dev, r);
228 dev_warn(&dev->dev, "BAR %d: bogus alignment "
233 for (list = head; ; list = list->next) {
234 resource_size_t align = 0;
235 struct resource_list *ln = list->next;
238 align = pci_resource_alignment(ln->dev, ln->res);
240 if (r_align > align) {
241 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
243 panic("pdev_sort_resources(): "
244 "kmalloc() failed!\n");
255 int pci_enable_resources(struct pci_dev *dev, int mask)
261 pci_read_config_word(dev, PCI_COMMAND, &cmd);
264 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
265 if (!(mask & (1 << i)))
268 r = &dev->resource[i];
270 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
272 if ((i == PCI_ROM_RESOURCE) &&
273 (!(r->flags & IORESOURCE_ROM_ENABLE)))
277 dev_err(&dev->dev, "device not available because of "
278 "BAR %d %pR collisions\n", i, r);
282 if (r->flags & IORESOURCE_IO)
283 cmd |= PCI_COMMAND_IO;
284 if (r->flags & IORESOURCE_MEM)
285 cmd |= PCI_COMMAND_MEMORY;
288 if (cmd != old_cmd) {
289 dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
291 pci_write_config_word(dev, PCI_COMMAND, cmd);